On 13-Nov-10, at 12:39 PM, Raj Mathur (राज माथुर) wrote:
[snip]
He wanted a formula. He has not got a formula.
Here's a formula:
y = x * 1.0158
Explanation:
I decided to check the ext3 overhead empirically, since I not keen to
delve into the resize2fs sources. I've attached a simple python script
that I used on a bunch of machines to measure the difference between
block device size (reported by /proc/partitions)
and fs size (as reported by statfs). It currently reports on all
mounted ext2 and ext3 filesystems.
I might be doing something really dumb, but it looks like there is
1.56-58% overhead for almost all ext3 filesystems over 1G in size
created with default mkfs flags. It gets higher for smaller
filesystems. Note that the journal overhead may not be included in
this value.
If anyone gets different values or finds any errors in the attached
script I'd appreciate a note.
End of story.
It's kind of a boring story.
-Taj.
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